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Electromagnetic Metamaterials
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Electromagnetic Metamaterials and their
Approximations:
Practical and Theoretical Aspects
CSIC Building (#406),
Seminar Room 4122.
Directions: home.cscamm.umd.edu/directions
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Transformation
Media for the Extreme Control of Light
Professor
Alexander Kildishev
Purdue University
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Abstract:
The presented overview is focused on optical
metamaterials designed for extreme control over the
flow of light at both the nano- and macroscopic
scales. These extreme metamaterials incorporate the
innovative theories of transformation optics (TO),
and hyperlens and are pertinent to the important
areas of optical cloaking, sub-wavelength sensing,
super-resolution imaging, and magnifying hyperlens.
Increasing attention has been applied to creating an
electromagnetic cloak of invisibility based on
various schemes, including dipolar scattering
cancellation and TO, but practical applications of
TO go far beyond just cloaking. The TO theory, built
on fundamental variational principles allows the
control of light in an extreme and ultimate manner
by providing a general recipe for obtaining complex
spatial distributions of anisotropic permittivity
and permeability.
Using these distributions, a curvilinear optical
space is made, creating the channel for the desired
flow of light. Extreme control of light requires
extreme optical properties, which can be gained only
in the sub-wavelength-scale composition of
dispersive and non-dispersive materials. The
adaptive algorithms based on stochastic optimization
techniques, providing ultimate metamaterial designs,
are an instrumental part of our on-going studies.
In the talk the emphasis is made on complex physical
phenomena at the interfaces and inside the
dispersive elements, i.e. size- and surface effects
and the effect of structural disorders in
highly-anisotropic materials, which should be
incorporated into the computational models for the
ultimate design of the extreme metamaterials. |
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